+1 to both jyjjy's comments.
Your PSU seems fine for most newer midrange graphic cards. BFG isnt known for its PSUs, but they do have a quality reputation in other areas--so I at least know they wouldnt try to sell something thats crap.
Depending on your price availability:
$93 w/ FREE SHIPPING ATI 4850 (A fantastic deal)http://www.newegg.com/Product/Product.aspx?Item=N82E16814102824&cm_re=4850-_-14-102-824-_-Product
$130ish ATI 5750 (good, but not that much better than the 4850)
$ 150s ATI 5770
Your choice should really depend on your monitor resolution, and what kind of performance you want to pay for.